The ANSI 50/51 protection option in SEPAM relays combine both ANSI 50 instantaneous phase overcurrent protection and ANSI 51 delayed phase overcurrent protection.
In order to activate ANSI 50 protection, an instantaneous delay of 50ms must be set for the time delay. This is the lowest response time of the relay to a short-circuit fault. This includes Operating time + Overshoot time.

In order to activate ANSI 51 protection, a delay greater than 50ms must be set for the same parameter setting time delay. This will allow the end-user to use ANSI 51 delayed phase overcurrent protection.

AEDL3

Legacy KB System (APS) Data: RESL203113 V1.0, Originally authored by MiZe on 08/14/2010, Last Edited by MiZe on 08/14/2010
Related ranges: Sepam series 80, Sepam series 40, Sepam series 20